A DC circuit is described as

A DC circuit is described as

• A. A circuit that carries alternating current, or current that periodically reverses direction
• B. A circuit that uses a direct current
• C. A circuit that carries direct current, or current that flows in only one direction
• D. A circuit that contains a battery and transformer

Answer: (C)

Direct current flows in one direction and maintains fixed polarity. A DC circuit is powered by sources that keep that unidirectional flow, like batteries or DC power supplies. The description that fits best is a circuit that carries direct current, or current that flows in only one direction, because it captures both the type of current and its unidirectional nature. The other ideas are less precise or misleading in this context: alternating current describes current that reverses direction, which isn't the case in a DC circuit; simply saying it uses direct current is true but doesn’t emphasize the unidirectional flow; and a circuit with a battery and transformer isn’t accurate since transformers require changing (AC) current to operate.

Direct current flows in one direction and maintains fixed polarity. A DC circuit is powered by sources that keep that unidirectional flow, like batteries or DC power supplies. The description that fits best is a circuit that carries direct current, or current that flows in only one direction, because it captures both the type of current and its unidirectional nature. The other ideas are less precise or misleading in this context: alternating current describes current that reverses direction, which isn't the case in a DC circuit; simply saying it uses direct current is true but doesn’t emphasize the unidirectional flow; and a circuit with a battery and transformer isn’t accurate since transformers require changing (AC) current to operate.